Improvement in fruit-jars



T. q. OTTERSONQ FRUIT-JARS.

' Patented. Nov. 21,1876.

N.FETERS FHOTD UTHOGRAPNER. WASHINGTON D C STATES THOMAS G. OTTEBSON, OFPHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN FRUIT-JARS.

Specification forming part of Letters Patent No. 184,478, dated November21, 1876; application filed March 23, 1876.

To all whom it may concern Be it known that I, T. G. OTTERSON, ofPhiladelphia, in the county of Philadelphia and State of Pennsylvania,have invented certain new and useful Improvements in Fruit- Jars; and 1do hereby declare the following to be a full, clear, and exactdescription of the invention, such as Will enable others skilled in theart to which it pertains to make and use it, reference being bad to theaccompanying drawings, which form part of this specification.

My invention relates to certain improvevents in fruit-jars.

Heretofore fruit-jars have ordinarily been constructed with a singlescrew-thread formed on the neck of the jar, and a corresponding singlescrew=thread on a flanged metallic ring that serves to retain thecoveragainst the gasket placed on the breast or shoulder of the jar.

Fruit-jars constructed as above set forth are objectionable, for thereason that the pressure exerted by the single screw is not uniformlydisposed on all parts of the gasket, it being greater on that portion ofthe gasket nearest the screw-thread,and thereby the metallicring tendsto crimp the gasket, and does not act to press one portion of the sametightly against the shoulder of the jar. Again, in glass fruitjars ofordinary construction the lower portion of the thread on the neck of thesame is blown fuller than the upper portion of the thread. As thescrew-thread on the metallic ring must be of sufficient size to workfreely on the lower and larger portion of the thread, the metallic ring,when forced to its seat, draws that portion of the gasket in line withthe lowest portion of the thread down snugly against the shoulder of thejar, while the opposite portion of the screw-thread fits the thread onthe jar in an imperfect manner, and thereby produces an uneven pressureof the cover on the gasket, and, owing to this uneven pressure, thethreads on one side of the metallic ring are often thrown entirely offthe thread on the same side of the neck of the jar, thereby renderinguseless many single-threaded jars.

In my Patent No. 174,638, dated March 14, 187 6,which related to thatclass of jars wherein the covers are formed solid and secured to theneck of the jar to bear against a gasket located below thescrew-threads, the improvement consists in forming the neck of the jarand-the cover with two separate parallel screwthreads, which commenceand terminate at diametrically opposite points on the neck and ring ofthe jar.

The object of this invention is to improve the construction of thatclass of jars wherein the shoulder and gasket are located above thescrew-threads, and a separate cover is firmly.

represents a side elevation of my improved fruit-jar. Fig. 2 representsthe neck of the jar. Fig. 3 shows the cap and gasket as applied to theneck of the jar. Fig. 4 is a vertical section through line as a; of Fig.1.

A represents a fruit-jar, having a neck, B,

upon which are which formed two or more screwthreads, 00 b, the samepreferably commencing at c c, on opposite sides of the neck B, andterminating at d d, or about midway between their starting points. Thescrew-threads, being arranged relatively to each other, as shown, affordclose and direct purchase for the upper threads of a metallic ring, andon opposite sides of the same, and also an equally closeand directpurchase for the lower portions of the threads of the metallic ring, ona line at right angles to the upper line of direct purchase. 0 is abreast or shoulder formed on neck B, just below its edge e, and servesas a bearing or seat for an india-rubber or other elastic gasket, D. Thecover E, of glass or metal, has an oval or rounded edge, f, that.

engages with the upper surface of gasket D. Ring F, preferably of metal,is formed with double screw-threads g h, of a form and relativelyarranged to snugly fit the screw-threads a b on the neck of the jar. Theupper portion.

of the screw-rin g F is formed with an inwardly-turned flange, G, ofsufficient width to have a firm bearing on an annular bearing, H, of thecover E.

As heretofore stated, a jar constructed'as above set forth possesses theadvantage of an equalized pressure on the entire surfaceof the gasket,and thereby secures an airtight joint between the cover and the jar.Also, the screw-ring having an even and direct pressure on the threadsof the jar at four difi'erent points in its circumference, the ring isnot liable to slip off the threads of the jar, as is the case infruit-jars of ordinary construction.

Having fully described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

March, 187 6.

The combination, with cover E and :jarA, the latter=having its neck Bformed with separate parallel screw-threads a b, which; begin and end atopposite points on the neck of the jar, and a shoulder, 0, located abovethescrewthreads, of a ring, 13, correspondingly screwthreaded to fittheneclr of the jar, and provided with an inwardly-turned flange, G, to

engage with the cover, substantially as and for the purpose set forth.

In testimony that I claim the foregoing I have hereunto set my hand this21st day of THOMAS G. OTTERSON. Witnesses: F. F. BURMEISTER,

J. GORDON SHowAKER.

